Verification stays attached to the route.
Last verified 2026-03-19 / Private-well state guide
WA private well
Washington State Department of Health as the route anchor before any shopping path.
Private-well route for WA. This page stays reference-based and points users to official lab lookup, sampling guidance, and repeat-testing context.
Editorial owner
gabi Editorial Team
No external reviewer claim is made on this build.
Last verified
2026-03-19
Page-level review timestamp.
Scope
Private-well state guide
Action-first, not safe or unsafe and not a health diagnosis.
Verification details
Editorial owner
gabi Editorial Team
No external reviewer claim is made on this build.
Scope
Private-well state guide
Action-first, not safe or unsafe and not a health diagnosis.
State route
WA
State-specific guide and lab pathway.
Repeat testing
Guidance in view
Washington guidance should drive repeat testing and follow-up timing. No universal Sharp v1 cadence is assumed beyond current state health context and lab guidance.
Benchmark notes
Reference-based
Washington uses state PFAS action-level and drinking-water context for interpretation. Private well PFAS results remain reference-based and should not be framed as household compliance determinations.
Last verified
2026-03-19
State guidance and lab route review date.
Private-well next action
Test first, then interpret against state guidance.
State-specific lab and sampling guidance should appear before any filter shopping or whole-house escalation.
Sampling and testing
What to do first
- Use the state-certified lab route rather than a generic home test suggestion.
- Follow the state sampling instructions before collecting a PFAS well sample.
- Keep interpretation reference-based and avoid calling a private well compliant or non-compliant.
Notes
Interpretation context
- Washington guidance should drive repeat testing and follow-up timing. No universal Sharp v1 cadence is assumed beyond current state health context and lab guidance.
- Washington uses state PFAS action-level and drinking-water context for interpretation. Private well PFAS results remain reference-based and should not be framed as household compliance determinations.
Guide-defined next lanes
Keep private-well intent inside the action stack before shopping broadens.
This state page should hand off into a small number of high-intent guides that settle evidence order, certification logic, and ownership burden before a household drifts into generic PFAS browsing.
Evidence order
Should you test before buying a PFAS filter?
Start with test-first logic so the private-well route stays evidence-led before any product shortlist opens.
Private-well compare
Compare certified point-of-use after a well test
Open the compare lane only after the state route and test result are already interpretable.
Certification logic
Read NSF 53 vs 58 with the PFAS claim in view
Use the certification guide to keep badge shorthand from replacing exact model and claim review.
Ownership burden
Review annual cost before the treatment class grows
Keep recurring cost visible before a private-well household overbuys the wrong treatment class.
State reference context
Washington PFAS state action levels aligned to federal MCLs
Washington historically used PFAS state action levels and, effective January 15, 2026, aligned those SAL values with the federal PFAS MCL values while maintaining state monitoring and trigger logic.
Washington SAL for PFOA
4 ppt (Aligned to federal MCL effective 2026-01-15.)
Washington SAL for PFOS
4 ppt (Aligned to federal MCL effective 2026-01-15.)
Washington SAL for PFHxS
10 ppt (Federal MCL is scheduled at 4 ppt in 2029, but current state SAL is 10 ppt.)
Washington SAL for PFNA
10 ppt (Aligned state action level remains 10 ppt.)
Washington SAL for HFPO-DA
10 ppt (Added as part of Washington's PFAS transition to the federal structure.)
Quick benchmark check
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